Polls in compose

2022-02-13 00:29:15 +03:00
parent dc63d054dc
commit ce258f1b54
9 changed files with 374 additions and 5 deletions
--- a/mastodon/src/main/java/org/joinmastodon/android/ui/views/ReorderableLinearLayout.java
+++ b/mastodon/src/main/java/org/joinmastodon/android/ui/views/ReorderableLinearLayout.java
@@ -0,0 +1,121 @@
+package org.joinmastodon.android.ui.views;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewTreeObserver;
+import android.widget.LinearLayout;
+
+import androidx.annotation.Nullable;
+import me.grishka.appkit.utils.CubicBezierInterpolator;
+import me.grishka.appkit.utils.V;
+
+public class ReorderableLinearLayout extends LinearLayout{
+	private static final String TAG="ReorderableLinearLayout";
+
+	private View draggedView;
+	private View bottomSibling, topSibling;
+	private float startY;
+	private OnDragListener dragListener;
+
+	public ReorderableLinearLayout(Context context){
+		super(context);
+	}
+
+	public ReorderableLinearLayout(Context context, @Nullable AttributeSet attrs){
+		super(context, attrs);
+	}
+
+	public ReorderableLinearLayout(Context context, @Nullable AttributeSet attrs, int defStyleAttr){
+		super(context, attrs, defStyleAttr);
+	}
+
+	public void startDragging(View child){
+		getParent().requestDisallowInterceptTouchEvent(true);
+		draggedView=child;
+		draggedView.animate().translationZ(V.dp(1f)).setDuration(150).setInterpolator(CubicBezierInterpolator.DEFAULT).start();
+
+		int index=indexOfChild(child);
+		if(index==-1)
+			throw new IllegalArgumentException("view "+child+" is not a child of this layout");
+		if(index>0)
+			topSibling=getChildAt(index-1);
+		if(index<getChildCount()-1)
+			bottomSibling=getChildAt(index+1);
+	}
+
+	@Override
+	public boolean onInterceptTouchEvent(MotionEvent ev){
+		if(draggedView!=null){
+			startY=ev.getY();
+			return true;
+		}
+		return false;
+	}
+
+	@Override
+	public boolean onTouchEvent(MotionEvent ev){
+		if(draggedView!=null){
+			if(ev.getAction()==MotionEvent.ACTION_UP || ev.getAction()==MotionEvent.ACTION_CANCEL){
+				endDrag();
+				draggedView=null;
+				bottomSibling=null;
+				topSibling=null;
+			}else if(ev.getAction()==MotionEvent.ACTION_MOVE){
+				draggedView.setTranslationY(ev.getY()-startY);
+				if(topSibling!=null && draggedView.getY()<=topSibling.getY()){
+					moveDraggedView(-1);
+				}else if(bottomSibling!=null && draggedView.getY()>=bottomSibling.getY()){
+					moveDraggedView(1);
+				}
+			}
+		}
+		return super.onTouchEvent(ev);
+	}
+
+	private void endDrag(){
+		draggedView.animate().translationY(0f).translationZ(0f).setDuration(200).setInterpolator(CubicBezierInterpolator.DEFAULT).start();
+	}
+
+	private void moveDraggedView(int positionOffset){
+		int index=indexOfChild(draggedView);
+		int prevTop=draggedView.getTop();
+		removeView(draggedView);
+		int prevIndex=index;
+		index+=positionOffset;
+		addView(draggedView, index);
+		final View prevSibling=positionOffset<0 ? topSibling : bottomSibling;
+		int prevSiblingTop=prevSibling.getTop();
+		if(index>0)
+			topSibling=getChildAt(index-1);
+		else
+			topSibling=null;
+		if(index<getChildCount()-1)
+			bottomSibling=getChildAt(index+1);
+		else
+			bottomSibling=null;
+		dragListener.onSwapItems(prevIndex, index);
+		draggedView.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener(){
+			@Override
+			public boolean onPreDraw(){
+				draggedView.getViewTreeObserver().removeOnPreDrawListener(this);
+				float offset=prevTop-draggedView.getTop();
+				startY-=offset;
+				draggedView.setTranslationY(draggedView.getTranslationY()+offset);
+				prevSibling.setTranslationY(prevSiblingTop-prevSibling.getTop());
+				prevSibling.animate().translationY(0f).setInterpolator(CubicBezierInterpolator.DEFAULT).setDuration(200).start();
+				return true;
+			}
+		});
+	}
+
+	public void setDragListener(OnDragListener dragListener){
+		this.dragListener=dragListener;
+	}
+
+	public interface OnDragListener{
+		void onSwapItems(int oldIndex, int newIndex);
+	}
+}